<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>ECharts-图形-渐变色</title>
  </head>
  <body>
    <div id="main" style="height: 400px"></div>
    <script src="../libs/echarts-5.3.3.js"></script>
    <script>
      window.onload = function () {
        let myChart = echarts.init(document.getElementById("main"));
        let option = {
          backgroundColor: "rgba(255, 0, 0, 0.1)",
          grid: {
            show: true,
            backgroundColor: "rgba(0, 255, 0, 0.1)",
          },

          tooltip: {
            show: true,
            // 使用了 trigger ，一般也结合 axisPointer
            trigger: "axis", // 默认是 item
            axisPointer: {
              type: "shadow", //  (默认是竖线 line)  (横线 + 竖线 cross)  (横线 + 竖线 shadow)
            },
            // formatter: '<div style="color:red">haha</div>'
          },

          xAxis: {
            data: ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"],
          },
          yAxis: {},
          series: [
            {
              type: "bar",
              // 图形的颜色
              itemStyle: {
                color: {
                  // 渐变
                  type: "linear",
                  x: 0,
                  y: 0,
                  x2: 0,
                  y2: 1,
                  colorStops: [
                    {
                      offset: 0,
                      color: "red",
                    },
                    {
                      offset: 1,
                      color: "blue",
                    },
                  ],
                },
              },
              data: [
                {
                  value: 5,
                  name: "衬衫", // 数据项名称, 比如pie系列 tooltip 需要用到
                  // 图形的颜色
                  itemStyle: {
                    color: new echarts.graphic.LinearGradient(
                      0,
                      0,
                      0,
                      1,
                      [
                        {
                          offset: 0,
                          color: "#20FF89",
                        },
                        {
                          offset: 1,
                          color: "rgba(255, 255, 255, 0)",
                        },
                      ],
                      false
                    ),
                  },
                },
                {
                  value: 20,
                  name: "羊毛衫",
                },
                {
                  value: 36,
                  name: "雪纺衫",
                },
                {
                  value: 10,
                  name: "裤子",
                },
                {
                  value: 10,
                  name: "高跟鞋",
                },
                {
                  value: 20,
                  name: "袜子",
                },
              ],
            },
          ],
        };
        myChart.setOption(option);
      };
    </script>
  </body>
</html>
